Fabrication of J aggregate films in synthetic polyanion matrix and their chemochromism
Liu, MH; Kira, A
Source PublicationTHIN SOLID FILMS
AbstractThe J aggregate formation of a cyanine dye, pseudoisocyanine (PIC), in the presence of synthetic polyanions, was studied both in aqueous solutions and film states. The dye formed J aggregates at low concentration (2 x 10(-5) M) in the presence of polyacrylic acid, sodium salt (PA) and polyvinyl sulfonic acid, potassium salt (PVS) in solutions, whereas the aggregation can only be formed at relative higher dye concentration (1 x 10(-4) M) in a polystyrenesulfonic acid, sodium salt (PSS) matrix. There existed an optimum condition for the J aggregate formation depending on R, the ratio of the concentration of polymer residue to the dye. R values were ca. 10, two and two for PA, PVS and PSS, respectively. The J aggregate films were fabricated by casting the solutions on glass substrates. The cast films of the dye in the PA and PSS matrices showed a new J band at 585 nm, while those from the PVS matrix were at 573 nm. Higher molecular weights of the polyanions lead to the formation of well-defined J aggregate, both in solution and in film. All the J aggregate films exhibited a chemochromism to HC and NH3 gases. The J band at 585 nm in the films can be changed to the J band at 575 nm by repeated successive exposure of the films to HCl and NH gases, suggesting that the metastable nature of the J aggregate lies at 585 nm. (C) 2000 Elsevier Science S.A. All rights reserved.
KeywordJ-aggregate Synthetic Polyanions Chemochromism Polymer Film
Indexed BySCI
WOS IDWOS:000084792900017
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Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorLiu, MH
Affiliation1.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Lab Colloid & Interface Sci, Beijing 100080, Peoples R China
2.RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan
Recommended Citation
GB/T 7714
Liu, MH,Kira, A. Fabrication of J aggregate films in synthetic polyanion matrix and their chemochromism[J]. THIN SOLID FILMS,2000,359(1):104-107.
APA Liu, MH,&Kira, A.(2000).Fabrication of J aggregate films in synthetic polyanion matrix and their chemochromism.THIN SOLID FILMS,359(1),104-107.
MLA Liu, MH,et al."Fabrication of J aggregate films in synthetic polyanion matrix and their chemochromism".THIN SOLID FILMS 359.1(2000):104-107.
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